The Kzin (singular: Kzin, plural, Kzinti), are a felinoid race in Larry Niven's Known Space universe. The race is extremely aggressive, using the 'scream and leap' philosophy of warfare, and, at the point of first contact with humans, technologically advanced. They nearly subjugated the human race after first contact, especially since humans, at that point in time, had become a pacifist race.
The Kzinti are a male-dominated society, so much so that the females of the race were specifically bred to be of lesser intelligence than the males. A female's only role in their society is to be a breeder.
In the Man-Kzin Wars series of anthologies, several stories describe the Zoo-Planet Kzinti, an isolated, low-technology, population which has intelligent females.
The race has also made appearances in Star Trek, including a (non-canonical) episode of Star Trek: The Animated Series which Niven wrote. Several decades later, the Kzinti were acknowledged for the first time in a canon Star Trek property, being referenced in dialogue in the first season Star Trek: Picard episode "Nepenthe". In Star Trek: Lower Decks, a Kzinti is seen serving as an ensign on the USS Cerritos.
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